If you die without a will then it would be shared amongst your nearest blood relatives first..if no living full blood relatives, then neices, nephews etc... if no relatives at all can be found then it goes to the state.
However I really think it is important to make a will so the money goes where you want it to go and not someone else deciding for you..
another thing to think about if you want it shared amongst a few people is to have it written in percentages and not amounts...savings, property values and some policies can go up and down ...
eg is.. my Great Aunty died last year, she had no children and had specified varying amounts to many family members/friends and the remaining amount (at the time the largest amount due to it including her home) to be shared equally between her two favourite neices... however, although the will was only a few years old her savings had reduced and her home had dropped drastically in value.. the two neices tried to make sure everyone got what they were left from her estate which at the time of writing the will would have come from savings/policies alone..but at the time of her death it wasn't enough and because her home had dropped in value so much they nearly ended up getting alot less than others named in the will which is never what my Aunty had wanted!!
So think very carefully how you write your will and try to make people very aware of what your wishes are
